Peugeot 304 front and rear turn signal bulbs utilize a P21W size across both positions. The replacement chart covers 1971 to 1972 production years with corresponding bulb specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The P21W is the sole bulb type specified for the Peugeot 304, appearing in both the front and rear turn signal positions across the 1971-1972 model years.
The P21W is a single-filament bulb, meaning it serves one lighting function only, which is consistent with its dedicated use in turn signal applications rather than combined stop/tail positions.
The P21W operates at 12 volts and draws 21 watts, placing it in the standard wattage range for turn signal bulbs under ECE regulations.
The BA15s designation refers to a single-contact bayonet base with a 15mm collar, distinguishing it from the BA15d double-contact variant used in dual-function bulbs.
The P21W conforms to ECE standards, a regulatory framework recognized across Europe and numerous other markets worldwide.
The front and rear turn signal positions on the 1971-1972 Peugeot 304 share the same P21W specification, indicating direct interchangeability between the two positions.